def __init__(self, outgoing_publishes):
self.max_inflight = 1
assert isinstance(outgoing_publishes, OutgoingPublishesBase)
self.publishes = outgoing_publishes
self.packets = deque()
self.retrial_handles = dict()
self.future = DummyFuture()
def clear(self):
"""
Clears the in-memory state of the outgoing queue. The data in
persistence is left as is. If there is any pending `Future`
waiting for result, it is cancelled.
"""
for packet_id in self.retrial_handles.keys():
self.cancel_retrial(packet_id)
self.packets.clear()
self.retrial_handles.clear()
if not self.future.done():
msg = 'Outgoing queue was cleansed'
self.future.set_exception(CancelledException(msg))
self.future = DummyFuture()
def __init__(self, outgoing_publishes):
self.max_inflight = 1
assert isinstance(outgoing_publishes, OutgoingPublishesBase)
self.publishes = outgoing_publishes
self.packets = deque()
self.retrial_handles = dict()
self.future = DummyFuture()
def clear(self):
"""
Clears the in-memory state of the outgoing queue. The data in
persistence is left as is. If there is any pending `Future`
waiting for result, it is cancelled.
"""
for packet_id in self.retrial_handles.keys():
self.cancel_retrial(packet_id)
self.packets.clear()
self.retrial_handles.clear()
if not self.future.done():
msg = 'Outgoing queue was cleansed'
self.future.set_exception(CancelledException(msg))
self.future = DummyFuture()
def get(self):
"""
Gets the next packet to be sent to the remote client.
:return: a `Future`
"""
if not self.future.done():
self.future.set_exception(CancelledException('Only one future supported'))
self.future = Future()
# try to start next publish flow first,
# otherwise the outgoing packets would have to deplete before
# any publish flows could start
started = self._start_next_flow()
if not started and self.packets:
self.future.set_result(self.packets.popleft())
return self.future
def get(self):
"""
Gets the next packet to be sent to the remote client.
:return: a `Future`
"""
if not self.future.done():
self.future.set_exception(
CancelledException('Only one future supported'))
self.future = Future()
# try to start next publish flow first,
# otherwise the outgoing packets would have to deplete before
# any publish flows could start
started = self._start_next_flow()
if not started and self.packets:
self.future.set_result(self.packets.popleft())
return self.future
class OutgoingQueue():
"""
This class controls packets to be delivered to the remote client.
It encapsulates the logic to send packets and start new publish flows.
"""
def __init__(self, outgoing_publishes):
self.max_inflight = 1
assert isinstance(outgoing_publishes, OutgoingPublishesBase)
self.publishes = outgoing_publishes
self.packets = deque()
self.retrial_handles = dict()
self.future = DummyFuture()
def retry_pending(self):
for packet in self.publishes.get_all_inflight():
self.retrial_handles[packet.id] = None
self.put(packet)
def put(self, packet):
"""
Puts a packet to the outgoing queue.
No checks are done on the provided packets.
"""
assert isinstance(packet, BaseMQTTMessage)
if not self.future.done():
self.future.set_result(packet)
else:
self.packets.append(packet)
def put_publish(self, packet):
"""
Puts a publish packet to the outgoing queue.
If the QoS level is 0 it is only placed on the outgoing queue.
Otherwise the packet is persisted and scheduled for publishing.
"""
assert isinstance(packet, Publish)
if packet.qos == 0:
self.put(packet)
else:
self.publishes.insert(packet)
self._start_next_flow()
def set_sent(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.publishes.set_sent(packet_id)
def is_sent(self, packet_id):
return self.publishes.is_inflight(packet_id) and \
self.publishes.is_sent(packet_id)
def is_pubconf(self, packet_id):
return self.publishes.is_inflight(packet_id) and \
self.publishes.is_pubconf(packet_id)
def set_pubconf(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.publishes.set_pubconf(packet_id)
def get(self):
"""
Gets the next packet to be sent to the remote client.
:return: a `Future`
"""
if not self.future.done():
self.future.set_exception(CancelledException('Only one future supported'))
self.future = Future()
# try to start next publish flow first,
# otherwise the outgoing packets would have to deplete before
# any publish flows could start
started = self._start_next_flow()
if not started and self.packets:
self.future.set_result(self.packets.popleft())
return self.future
def clear(self):
"""
Clears the in-memory state of the outgoing queue. The data in
persistence is left as is. If there is any pending `Future`
waiting for result, it is cancelled.
"""
for packet_id in self.retrial_handles.keys():
self.cancel_retrial(packet_id)
self.packets.clear()
self.retrial_handles.clear()
if not self.future.done():
msg = 'Outgoing queue was cleansed'
self.future.set_exception(CancelledException(msg))
self.future = DummyFuture()
def flow_completed(self, packet_id):
"""
Removes the publish corresponding to the `packet-id` from the inflight
set and from persistence.
"""
if packet_id:
self.publishes.remove(packet_id)
if packet_id in self.retrial_handles:
self.cancel_retrial(packet_id)
del self.retrial_handles[packet_id]
self._start_next_flow()
def _start_next_flow(self):
if self.publishes.inflight_len < self.max_inflight:
packet = self.publishes.get_next()
if packet:
self.retrial_handles[packet.id] = None
self.put(packet)
return True
return False
def _retry_flow(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.retrial_handles[packet_id] = None
self.put(self.publishes.get_inflight(packet_id))
def set_retrial(self, packet_id, deadline):
handle = self.retrial_handles.get(packet_id)
if handle:
self.cancel_retrial(packet_id)
callback = lambda: self._retry(packet_id)
handle = ioloop.IOLoop.current().add_timeout(deadline, callback)
self.retrial_handles[packet_id] = handle
def cancel_retrial(self, packet_id):
handler = self.retrial_handles.get(packet_id)
if handler is not None:
ioloop.IOLoop.current().remove_timeout(handler)
self.retrial_handles[packet_id] = None
def _retry(self, packet_id):
if packet_id in self.retrial_handles:
self._retry_flow(packet_id)
class OutgoingQueue():
"""
This class controls packets to be delivered to the remote client.
It encapsulates the logic to send packets and start new publish flows.
"""
def __init__(self, outgoing_publishes):
self.max_inflight = 1
assert isinstance(outgoing_publishes, OutgoingPublishesBase)
self.publishes = outgoing_publishes
self.packets = deque()
self.retrial_handles = dict()
self.future = DummyFuture()
def retry_pending(self):
for packet in self.publishes.get_all_inflight():
self.retrial_handles[packet.id] = None
self.put(packet)
def put(self, packet):
"""
Puts a packet to the outgoing queue.
No checks are done on the provided packets.
"""
assert isinstance(packet, BaseMQTTMessage)
if not self.future.done():
self.future.set_result(packet)
else:
self.packets.append(packet)
def put_publish(self, packet):
"""
Puts a publish packet to the outgoing queue.
If the QoS level is 0 it is only placed on the outgoing queue.
Otherwise the packet is persisted and scheduled for publishing.
"""
assert isinstance(packet, Publish)
if packet.qos == 0:
self.put(packet)
else:
self.publishes.insert(packet)
self._start_next_flow()
def set_sent(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.publishes.set_sent(packet_id)
def is_sent(self, packet_id):
return self.publishes.is_inflight(packet_id) and \
self.publishes.is_sent(packet_id)
def is_pubconf(self, packet_id):
return self.publishes.is_inflight(packet_id) and \
self.publishes.is_pubconf(packet_id)
def set_pubconf(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.publishes.set_pubconf(packet_id)
def get(self):
"""
Gets the next packet to be sent to the remote client.
:return: a `Future`
"""
if not self.future.done():
self.future.set_exception(
CancelledException('Only one future supported'))
self.future = Future()
# try to start next publish flow first,
# otherwise the outgoing packets would have to deplete before
# any publish flows could start
started = self._start_next_flow()
if not started and self.packets:
self.future.set_result(self.packets.popleft())
return self.future
def clear(self):
"""
Clears the in-memory state of the outgoing queue. The data in
persistence is left as is. If there is any pending `Future`
waiting for result, it is cancelled.
"""
for packet_id in self.retrial_handles.keys():
self.cancel_retrial(packet_id)
self.packets.clear()
self.retrial_handles.clear()
if not self.future.done():
msg = 'Outgoing queue was cleansed'
self.future.set_exception(CancelledException(msg))
self.future = DummyFuture()
def flow_completed(self, packet_id):
"""
Removes the publish corresponding to the `packet-id` from the inflight
set and from persistence.
"""
if packet_id:
self.publishes.remove(packet_id)
if packet_id in self.retrial_handles:
self.cancel_retrial(packet_id)
del self.retrial_handles[packet_id]
self._start_next_flow()
def _start_next_flow(self):
if self.publishes.inflight_len < self.max_inflight:
packet = self.publishes.get_next()
if packet:
self.retrial_handles[packet.id] = None
self.put(packet)
return True
return False
def _retry_flow(self, packet_id):
if self.publishes.is_inflight(packet_id):
self.retrial_handles[packet_id] = None
self.put(self.publishes.get_inflight(packet_id))
def set_retrial(self, packet_id, deadline):
handle = self.retrial_handles.get(packet_id)
if handle:
self.cancel_retrial(packet_id)
callback = lambda: self._retry(packet_id)
handle = ioloop.IOLoop.current().add_timeout(deadline, callback)
self.retrial_handles[packet_id] = handle
def cancel_retrial(self, packet_id):
handler = self.retrial_handles.get(packet_id)
if handler is not None:
ioloop.IOLoop.current().remove_timeout(handler)
self.retrial_handles[packet_id] = None
def _retry(self, packet_id):
if packet_id in self.retrial_handles:
self._retry_flow(packet_id)
